Hiya. I love the second photo with hammie hanging off the glass!
His wee face is hilarious!!!
Your Wodent Wheel I would place to the left hand side of your tank (at the short end of the tank as apposed to placing it against the back wall) I think this will be better space wise.
The straw nesting house I would have at the other end (where you already have it). Food dishes anywhere really! And coconut crunch tunnel in the centre somewhere? You can also buy cardboard parchment tunnels.
There are levels to could buy to give hammie another level inside the tank as he/she looks as if climbing is fun, although not too high incase of falls. A cheap idea would be this. Get two flat stones. Place one safely at each end of your tank. Get a new long piece of wood and place this onto your flat stones. You can also saw a piece to fit the length of your tank.
Only make this tall enough for hammie to hop up onto and you can place a food dish on here for hammie. Should be easy to put together! Do you know what I mean?